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The c-strtod module contains a string to number (‘double’)
conversion function operating on single-byte character strings, that operates
as if the locale encoding was ASCII.
(The "C" locale on many systems has the locale encoding "ASCII".)
The function is:
extern double c_strtod (const char *string, char **endp);
In particular, only a period ‘.’ is accepted as decimal point, even when the current locale’s notion of decimal point is a comma ‘,’, and no characters outside the basic character set are accepted.
On platforms without strtod_l, this function is not safe for use in
multi-threaded applications since it calls setlocale.